On Mon, Jul 10, 2017 at 4:23 PM, Alex Balashov <abalashov@evaristesys.com> wrote:

Hi,

By way of illustration, I have one server with children=8, a single UDP
listener, and 23 processes total:

--
21117 attendant
21118 udp receiver child=0 sock=xxx.xxx.xxx.xxx:5060
21119 udp receiver child=1 sock=xxx.xxx.xxx.xxx:5060
21120 udp receiver child=2 sock=xxx.xxx.xxx.xxx:5060
21121 udp receiver child=3 sock=xxx.xxx.xxx.xxx:5060
21122 udp receiver child=4 sock=xxx.xxx.xxx.xxx:5060
21123 udp receiver child=5 sock=xxx.xxx.xxx.xxx:5060
21124 udp receiver child=6 sock=xxx.xxx.xxx.xxx:5060
21125 udp receiver child=7 sock=xxx.xxx.xxx.xxx:5060
21126 slow timer
21127 timer
21128 MI FIFO
21129 ctl handler
21130 RTIMER USEC EXEC
21131 RTIMER USEC EXEC
21132 RTIMER USEC EXEC
21133 RTIMER USEC EXEC
21134 RTIMER USEC EXEC
21135 RTIMER USEC EXEC
21136 RTIMER USEC EXEC
21137 Dialog KA Timer
21138 Dialog Clean Timer
21139 tcp main process

# kamcmd -s /tmp/kamailio_ctl ps | wc -l
23
--

This appears to result in 23 total database connections to the Postgres
server:

--
# lsof -n | grep -i '^kam' | grep IPv4 | grep TCP | grep -i :postgres | wc -l
23
--

But I have another Kamailio server that has three listeners, two UDP and
one TCP, and children=24, i.e.

--
children=24
listen=udp:xxx.xxx.xxx.xxx:5060
listen=udp:yyy.yyy.yyy.yyy:5060
listen=tcp:zzz.zzz.zzz.zzz:5060
--

I am given to understand that the total number of worker processes there
will be (children_setting * listeners), i.e. 72 in this case, plus some
number of rtimer and supervisory processes, as in my case. And true
enough:

--
# kamcmd -s /tmp/kamailio_ctl ps | wc -l
86
# kamcmd -s /tmp/kamailio_ctl ps | sed 's/65.254.44.195/yyy.yyy.yyy.yyy/g' | sed 's/65.254.44.194/zzz.zzz.zzz.zzz/g'
22065 main process - attendant
22069 udp receiver child=0 sock=zzz.zzz.zzz.zzz:5060
22070 udp receiver child=1 sock=zzz.zzz.zzz.zzz:5060
22071 udp receiver child=2 sock=zzz.zzz.zzz.zzz:5060
22073 udp receiver child=3 sock=zzz.zzz.zzz.zzz:5060
22074 udp receiver child=4 sock=zzz.zzz.zzz.zzz:5060
22076 udp receiver child=5 sock=zzz.zzz.zzz.zzz:5060
22079 udp receiver child=6 sock=zzz.zzz.zzz.zzz:5060
22080 udp receiver child=7 sock=zzz.zzz.zzz.zzz:5060
22082 udp receiver child=8 sock=zzz.zzz.zzz.zzz:5060
22085 udp receiver child=9 sock=zzz.zzz.zzz.zzz:5060
22086 udp receiver child=10 sock=zzz.zzz.zzz.zzz:5060
22089 udp receiver child=11 sock=zzz.zzz.zzz.zzz:5060
22091 udp receiver child=12 sock=zzz.zzz.zzz.zzz:5060
22093 udp receiver child=13 sock=zzz.zzz.zzz.zzz:5060
22095 udp receiver child=14 sock=zzz.zzz.zzz.zzz:5060
22097 udp receiver child=15 sock=zzz.zzz.zzz.zzz:5060
22099 udp receiver child=16 sock=zzz.zzz.zzz.zzz:5060
22100 udp receiver child=17 sock=zzz.zzz.zzz.zzz:5060
22103 udp receiver child=18 sock=zzz.zzz.zzz.zzz:5060
22105 udp receiver child=19 sock=zzz.zzz.zzz.zzz:5060
22107 udp receiver child=20 sock=zzz.zzz.zzz.zzz:5060
22109 udp receiver child=21 sock=zzz.zzz.zzz.zzz:5060
22111 udp receiver child=22 sock=zzz.zzz.zzz.zzz:5060
22113 udp receiver child=23 sock=zzz.zzz.zzz.zzz:5060
22115 udp receiver child=0 sock=yyy.yyy.yyy.yyy:5060
22117 udp receiver child=1 sock=yyy.yyy.yyy.yyy:5060
22119 udp receiver child=2 sock=yyy.yyy.yyy.yyy:5060
22121 udp receiver child=3 sock=yyy.yyy.yyy.yyy:5060
22123 udp receiver child=4 sock=yyy.yyy.yyy.yyy:5060
22125 udp receiver child=5 sock=yyy.yyy.yyy.yyy:5060
22127 udp receiver child=6 sock=yyy.yyy.yyy.yyy:5060
22129 udp receiver child=7 sock=yyy.yyy.yyy.yyy:5060
22131 udp receiver child=8 sock=yyy.yyy.yyy.yyy:5060
22132 udp receiver child=9 sock=yyy.yyy.yyy.yyy:5060
22135 udp receiver child=10 sock=yyy.yyy.yyy.yyy:5060
22137 udp receiver child=11 sock=yyy.yyy.yyy.yyy:5060
22139 udp receiver child=12 sock=yyy.yyy.yyy.yyy:5060
22141 udp receiver child=13 sock=yyy.yyy.yyy.yyy:5060
22143 udp receiver child=14 sock=yyy.yyy.yyy.yyy:5060
22145 udp receiver child=15 sock=yyy.yyy.yyy.yyy:5060
22147 udp receiver child=16 sock=yyy.yyy.yyy.yyy:5060
22149 udp receiver child=17 sock=yyy.yyy.yyy.yyy:5060
22151 udp receiver child=18 sock=yyy.yyy.yyy.yyy:5060
22153 udp receiver child=19 sock=yyy.yyy.yyy.yyy:5060
22155 udp receiver child=20 sock=yyy.yyy.yyy.yyy:5060
22156 udp receiver child=21 sock=yyy.yyy.yyy.yyy:5060
22159 udp receiver child=22 sock=yyy.yyy.yyy.yyy:5060
22161 udp receiver child=23 sock=yyy.yyy.yyy.yyy:5060
22163 slow timer
22165 timer
22167 secondary timer
22168 ctl handler
22169 RTIMER USEC EXEC
22170 RTIMER USEC EXEC
22172 RTIMER USEC EXEC
22173 RTIMER USEC EXEC
22175 Dialog Clean Timer
22176 TIMER NH
22177 TIMER NH
22178 TIMER NH
22179 tcp receiver (generic) child=0
22180 tcp receiver (generic) child=1
22182 tcp receiver (generic) child=2
22184 tcp receiver (generic) child=3
22186 tcp receiver (generic) child=4
22188 tcp receiver (generic) child=5
22190 tcp receiver (generic) child=6
22192 tcp receiver (generic) child=7
22194 tcp receiver (generic) child=8
22196 tcp receiver (generic) child=9
22198 tcp receiver (generic) child=10
22200 tcp receiver (generic) child=11
22202 tcp receiver (generic) child=12
22204 tcp receiver (generic) child=13
22206 tcp receiver (generic) child=14
22208 tcp receiver (generic) child=15
22210 tcp receiver (generic) child=16
22212 tcp receiver (generic) child=17
22214 tcp receiver (generic) child=18
22216 tcp receiver (generic) child=19
22218 tcp receiver (generic) child=20
22220 tcp receiver (generic) child=21
22223 tcp receiver (generic) child=22
22225 tcp receiver (generic) child=23
22227 tcp main process
--

But, for some reason, the number of database connections to Postgres
seems to be considerably higher than the number of total processes:

--
# lsof -n | grep '^kam' | grep TCP | grep IPv4 | grep ':postgres' | wc -l
114
--

This is not due to orphaned/unterminated Kamailio processes. There's
only one process lineage:

--
|-kamailio(22065)-+-kamailio(22069)
| |-kamailio(22070)
| |-kamailio(22071)
| |-kamailio(22073)
| |-kamailio(22074)
| |-kamailio(22076)
| |-kamailio(22079)
| |-kamailio(22080)
| |-kamailio(22082)
| |-kamailio(22085)
| |-kamailio(22086)
| |-kamailio(22089)
| |-kamailio(22091)
| |-kamailio(22093)
| |-kamailio(22095)
| |-kamailio(22097)
| |-kamailio(22099)
| |-kamailio(22100)
| |-kamailio(22103)
| |-kamailio(22105)
| |-kamailio(22107)
| |-kamailio(22109)
| |-kamailio(22111)
| |-kamailio(22113)
| |-kamailio(22115)
| |-kamailio(22117)
| |-kamailio(22119)
| |-kamailio(22121)
| |-kamailio(22123)
| |-kamailio(22125)
| |-kamailio(22127)
| |-kamailio(22129)
| |-kamailio(22131)
| |-kamailio(22132)
| |-kamailio(22135)
| |-kamailio(22137)
| |-kamailio(22139)
| |-kamailio(22141)
| |-kamailio(22143)
| |-kamailio(22145)
| |-kamailio(22147)
| |-kamailio(22149)
| |-kamailio(22151)
| |-kamailio(22153)
| |-kamailio(22155)
| |-kamailio(22156)
| |-kamailio(22159)
| |-kamailio(22161)
| |-kamailio(22163)
| |-kamailio(22165)
| |-kamailio(22167)
| |-kamailio(22168)
| |-kamailio(22169)
| |-kamailio(22170)
| |-kamailio(22172)
| |-kamailio(22173)
| |-kamailio(22175)
| |-kamailio(22176)
| |-kamailio(22177)
| |-kamailio(22178)
| |-kamailio(22179)
| |-kamailio(22180)
| |-kamailio(22182)
| |-kamailio(22184)
| |-kamailio(22186)
| |-kamailio(22188)
| |-kamailio(22190)
| |-kamailio(22192)
| |-kamailio(22194)
| |-kamailio(22196)
| |-kamailio(22198)
| |-kamailio(22200)
| |-kamailio(22202)
| |-kamailio(22204)
| |-kamailio(22206)
| |-kamailio(22208)
| |-kamailio(22210)
| |-kamailio(22212)
| |-kamailio(22214)
| |-kamailio(22216)
| |-kamailio(22218)
| |-kamailio(22220)
| |-kamailio(22223)
| |-kamailio(22225)
| `-kamailio(22227)
--

Yet, for some reason, some of the processes have two established DB
connections from different ports:

--
kamailio 22220 root 3u IPv4 189895303 0t0 TCP 127.0.0.1:46550->127.0.0.1:postgres (ESTABLISHED)
kamailio 22220 root 86u IPv4 189895067 0t0 TCP 127.0.0.1:46458->127.0.0.1:postgres (ESTABLISHED)
kamailio 22223 root 3u IPv4 189895315 0t0 TCP 127.0.0.1:46556->127.0.0.1:postgres (ESTABLISHED)
kamailio 22223 root 86u IPv4 189895067 0t0 TCP 127.0.0.1:46458->127.0.0.1:postgres (ESTABLISHED)
kamailio 22225 root 3u IPv4 189895321 0t0 TCP 127.0.0.1:46560->127.0.0.1:postgres (ESTABLISHED)
kamailio 22225 root 86u IPv4 189895067 0t0 TCP 127.0.0.1:46458->127.0.0.1:postgres (ESTABLISHED)
kamailio 22227 root 86u IPv4 189895067 0t0 TCP 127.0.0.1:46458->127.0.0.1:postgres (ESTABLISHED)
--

... while others don't ...

--
kamailio 22111 root 3u IPv4 189894820 0t0 TCP 127.0.0.1:46326->127.0.0.1:postgres (ESTABLISHED)
kamailio 22113 root 3u IPv4 189894828 0t0 TCP 127.0.0.1:46332->127.0.0.1:postgres (ESTABLISHED)
kamailio 22115 root 3u IPv4 189894834 0t0 TCP 127.0.0.1:46334->127.0.0.1:postgres (ESTABLISHED)
kamailio 22117 root 3u IPv4 189894842 0t0 TCP 127.0.0.1:46338->127.0.0.1:postgres (ESTABLISHED)
kamailio 22119 root 3u IPv4 189894848 0t0 TCP 127.0.0.1:46340->127.0.0.1:postgres (ESTABLISHED)
--

So, this gives rise to two questions in my mind:

1. I don't seem to understand the relationship between the number of
database connection handles and the total number of child processes.

I had always assumed that only SIP workers and other processes
specialised into a role with possible "database involvement" (e.g.
rtimer, async workers, etc.) would hold database connections.

2. What's going on in the second scenario such that some processes have
two connections?

Both servers running:

--
# kamcmd -s /tmp/kamailio_ctl core.version
kamailio 4.4.6 (x86_64/linux) becbde
--

Insights much appreciated!

-- Alex

--
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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